Improvement in stone-sawing machines



H. COTTRELLl l y StuneiSawing Machiqgs. N0.144,317.T

Patented Nov. 4,1873.

UNITED STATES PATENT OFFICE.

HERBERT COTTRELL, OF NEWARK, NEW JERSEY.

IMPROVEMENT VlN STONE-SAWING MASHINES.

Specification forming part of Letters Patent No. 144,317, dated November4, 1873 5 application filed May e, 1873.

To all whom fit may concern:

Be it known that I, HERBERT COTTRELL, of the city of Newark, county ofEssex, State of New Jersey, have invented certain Improvements inStone-sawing Machines, of

i whichthe following is a specication:

My invention relates to a series of sections or pieces of steel, inwhich are partly embedded carbons or black diamonds, presenting aprojecting cutting-surface in the ordinary manner, in combination with arunning endless metallic band, passing over rapidlyrevolving pulleysabove and below, constructed and operating in a manner similar to thewell-known band-saws for Working in wood, the steel sections, armed withcarbons, taking the place of teeth at intervals, and the pulleys beingcovered upon the surface coming in contact with the band with ayielding' or elastic substance, to protect the sections and carbons fromcontact with and wear upon the pulleys.

The high velocity attained by this method enables the execution of manytimes the amount of work obtained by any other plan for using thediamond in connection with sawblades.

The motion of the saw being in one direc- Ition only, the tendency is topress the carbons more iirmly in their sockets, and does away with theliability of their becoming loosened and falling out, as inreciprocating saws.

In the accompanying drawing the manner in which my invention is or maybe carried into effect is clearly represented.

Figure l is a perspective view of a machine embodying my improvement.Figs. 2

Vand 3 are views of details hereinafter declined in such position thatthe revolution of the band will tend to force the carbons more rmlytherein.

The steel sections B are preferably formed as shown in Fig. 2, the edgea projecting beyond the face of the section which is next to the band,so that when the section is applied to the band its said edge a willoverlap the edge of the band, as indicated.

In Fig. 3 I have represented a way of male ing the band of uniformthickness, thus enabling it to pass between guides for the purpose ofsteadying it. In the band shown in Fig. l the sections project from theouter surface of the band; but in the one now under consideration, theband is in substance formed of two series of metallic strips, placedface to face and fastened together, the carbon sections being set inbetween the adjoining ends of the stripsvof one series, so that theywill be iiush with the faces of these strips.

rlhe band, with its carbon sections, is de signed to run over upper andlower pulleys, G, supported by suitable framing D, which also carries ahorizontal table, E, intermediate between the pulleys. The frontvertical part of the band passes down through the table, as indicated inFig. l.

In order to facilitate the movement of the stone in any desireddirection on the table, friction rollers or balls c are provided on theupper face of the table, held in suitable sockets, and projectingsomewhat above the surface of the table, so that the stone can rest onthem.

The peripheries of pulleys C are covered, as indicated at d, withleather, vulcanized rubber, or other elastic or yielding substance, forthe purpose hereinbefore mentioned.

What I claim, and desire to secure by Letters Patent, isfl. Theabovedescribed endless metallic' running band, in combination withsections or pieces of steel placed at intervals inthe edge of said band,in which sections of steel carbons are partly embedded, and present aprojecting cutting-surface, substantially as set forth. y

2. The endless metallic ruiming band with carbon-armed sections, incombination with upper and lower pulleys, the periphery of which iscovered with a yielding or elastic substance, substantially as and forthe purposes set forth.

HERBERT GOTTRELL. `Witnesses I. M. TAYLOR,

I-I. C. Cornici?.

